[ZOOKEEPER-3385] Add admin command to display leader - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Trivial
Resolution: Fixed
Affects Version/s: 3.6.0
Fix Version/s: 3.6.0
Component/s: server
Labels:
- pull-request-available

Description

Each QuorumPeer prints the identity of the server it believes is the leader in its logs but that is not easily turned into diagnostic information about the state of the ensemble. It can be useful in debugging various issues, both when a quorum is struggling to be established and when a minority of peers are failing to follow, to see at a glance which peers are following the leader elected by the majority and which peers are either not following or following a different server.

Create an admin command that exposes which server a peer believes is the current leader.